diff --git a/src/driver.h b/src/driver.h
index 8907621..caf29c4 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -88,9 +88,6 @@ typedef struct message {
 typedef struct store {
 	struct store *next;
 	store_conf_t *conf; /* foreign */
-
-	/* currently open mailbox */
-	int uidvalidity;
 } store_t;
 
 typedef struct {
@@ -174,7 +171,7 @@ struct driver {
 	/* Open the selected mailbox.
 	 * Note that this should not directly complain about failure to open. */
 	void (*open_box)( store_t *ctx,
-	                  void (*cb)( int sts, void *aux ), void *aux );
+	                  void (*cb)( int sts, int uidvalidity, void *aux ), void *aux );
 
 	/* Return the minimal UID the next stored message will have. */
 	int (*get_uidnext)( store_t *ctx );
diff --git a/src/drv_imap.c b/src/drv_imap.c
index d6bd177..baba08d 100644
--- a/src/drv_imap.c
+++ b/src/drv_imap.c
@@ -112,7 +112,7 @@ struct imap_store {
 	// note that the message counts do _not_ reflect stats from msgs,
 	// but mailbox totals. also, don't trust them beyond the initial load.
 	int total_msgs, recent_msgs;
-	int uidnext;
+	int uidvalidity, uidnext;
 	message_t *msgs;
 	message_t **msgapp; /* FETCH results */
 	uint caps; /* CAPABILITY results */
@@ -1166,7 +1166,7 @@ parse_response_code( imap_store_t *ctx, imap_cmd_t *cmd, char *s )
 		goto bad_resp;
 	if (!strcmp( "UIDVALIDITY", arg )) {
 		if (!(arg = next_arg( &s )) ||
-		    (ctx->gen.uidvalidity = strtoll( arg, &earg, 10 ), *earg))
+		    (ctx->uidvalidity = strtoll( arg, &earg, 10 ), *earg))
 		{
 			error( "IMAP error: malformed UIDVALIDITY status\n" );
 			return RESP_CANCEL;
@@ -1186,7 +1186,7 @@ parse_response_code( imap_store_t *ctx, imap_cmd_t *cmd, char *s )
 		error( "*** IMAP ALERT *** %s\n", p );
 	} else if (cmd && !strcmp( "APPENDUID", arg )) {
 		if (!(arg = next_arg( &s )) ||
-		    (ctx->gen.uidvalidity = strtoll( arg, &earg, 10 ), *earg) ||
+		    (ctx->uidvalidity = strtoll( arg, &earg, 10 ), *earg) ||
 		    !(arg = next_arg( &s )) ||
 		    !(((imap_cmd_out_uid_t *)cmd)->out_uid = atoi( arg )))
 		{
@@ -2340,25 +2340,33 @@ imap_get_box_path( store_t *gctx ATTR_UNUSED )
 	return 0;
 }
 
+typedef struct {
+	imap_cmd_t gen;
+	void (*callback)( int sts, int uidvalidity, void *aux );
+	void *callback_aux;
+} imap_cmd_open_box_t;
+
 static void imap_open_box_p2( imap_store_t *, imap_cmd_t *, int );
 static void imap_open_box_p3( imap_store_t *, imap_cmd_t *, int );
+static void imap_open_box_p4( imap_store_t *, imap_cmd_open_box_t *, int );
 
 static void
 imap_open_box( store_t *gctx,
-               void (*cb)( int sts, void *aux ), void *aux )
+               void (*cb)( int sts, int uidvalidity, void *aux ), void *aux )
 {
 	imap_store_t *ctx = (imap_store_t *)gctx;
-	imap_cmd_simple_t *cmd;
+	imap_cmd_open_box_t *cmd;
 	char *buf;
 
 	if (prepare_box( &buf, ctx ) < 0) {
-		cb( DRV_BOX_BAD, aux );
+		cb( DRV_BOX_BAD, UIDVAL_BAD, aux );
 		return;
 	}
 
+	ctx->uidvalidity = UIDVAL_BAD;
 	ctx->uidnext = 0;
 
-	INIT_IMAP_CMD(imap_cmd_simple_t, cmd, cb, aux)
+	INIT_IMAP_CMD(imap_cmd_open_box_t, cmd, cb, aux)
 	cmd->gen.param.failok = 1;
 	imap_exec( ctx, &cmd->gen, imap_open_box_p2,
 	           "SELECT \"%\\s\"", buf );
@@ -2368,15 +2376,15 @@ imap_open_box( store_t *gctx,
 static void
 imap_open_box_p2( imap_store_t *ctx, imap_cmd_t *gcmd, int response )
 {
-	imap_cmd_simple_t *cmdp = (imap_cmd_simple_t *)gcmd;
-	imap_cmd_simple_t *cmd;
+	imap_cmd_open_box_t *cmdp = (imap_cmd_open_box_t *)gcmd;
+	imap_cmd_open_box_t *cmd;
 
 	if (response != RESP_OK || ctx->uidnext) {
-		imap_done_simple_box( ctx, &cmdp->gen, response );
+		imap_open_box_p4( ctx, cmdp, response );
 		return;
 	}
 
-	INIT_IMAP_CMD(imap_cmd_simple_t, cmd, cmdp->callback, cmdp->callback_aux)
+	INIT_IMAP_CMD(imap_cmd_open_box_t, cmd, cmdp->callback, cmdp->callback_aux)
 	cmd->gen.param.lastuid = 1;
 	imap_exec( ctx, &cmd->gen, imap_open_box_p3,
 	           "UID FETCH *:* (UID)" );
@@ -2385,11 +2393,20 @@ imap_open_box_p2( imap_store_t *ctx, imap_cmd_t *gcmd, int response )
 static void
 imap_open_box_p3( imap_store_t *ctx, imap_cmd_t *gcmd, int response )
 {
+	imap_cmd_open_box_t *cmdp = (imap_cmd_open_box_t *)gcmd;
+
 	// This will happen if the box is empty.
 	if (!ctx->uidnext)
 		ctx->uidnext = 1;
 
-	imap_done_simple_box( ctx, gcmd, response );
+	imap_open_box_p4( ctx, cmdp, response );
+}
+
+static void
+imap_open_box_p4( imap_store_t *ctx, imap_cmd_open_box_t *cmdp, int response )
+{
+	transform_box_response( &response );
+	cmdp->callback( response, ctx->uidvalidity, cmdp->callback_aux );
 }
 
 static int
diff --git a/src/drv_maildir.c b/src/drv_maildir.c
index ef92987..2017c44 100644
--- a/src/drv_maildir.c
+++ b/src/drv_maildir.c
@@ -70,7 +70,7 @@ typedef struct {
 typedef struct {
 	store_t gen;
 	uint opts;
-	int uvfd, uvok, nuid, is_inbox, fresh[3];
+	int uvfd, uvok, uidvalidity, nuid, is_inbox, fresh[3];
 	int minuid, maxuid, newuid, seenuid;
 	int_array_t excs;
 	char *path; /* own */
@@ -657,7 +657,7 @@ maildir_store_uidval( maildir_store_t *ctx )
 	if (ctx->db) {
 		key.data = (void *)"UIDVALIDITY";
 		key.size = 11;
-		uv[0] = ctx->gen.uidvalidity;
+		uv[0] = ctx->uidvalidity;
 		uv[1] = ctx->nuid;
 		value.data = uv;
 		value.size = sizeof(uv);
@@ -672,7 +672,7 @@ maildir_store_uidval( maildir_store_t *ctx )
 	} else
 #endif /* USE_DB */
 	{
-		n = sprintf( buf, "%d\n%d\n", ctx->gen.uidvalidity, ctx->nuid );
+		n = sprintf( buf, "%d\n%d\n", ctx->uidvalidity, ctx->nuid );
 		lseek( ctx->uvfd, 0, SEEK_SET );
 		if (write( ctx->uvfd, buf, n ) != n || ftruncate( ctx->uvfd, n ) || (UseFSync && fdatasync( ctx->uvfd ))) {
 			error( "Maildir error: cannot write UIDVALIDITY.\n" );
@@ -686,7 +686,7 @@ maildir_store_uidval( maildir_store_t *ctx )
 static int
 maildir_init_uidval( maildir_store_t *ctx )
 {
-	ctx->gen.uidvalidity = time( 0 );
+	ctx->uidvalidity = time( 0 );
 	ctx->nuid = 0;
 	ctx->uvok = 0;
 #ifdef USE_DB
@@ -754,14 +754,14 @@ maildir_uidval_lock( maildir_store_t *ctx )
 			}
 			return maildir_init_uidval_new( ctx );
 		}
-		ctx->gen.uidvalidity = ((int *)value.data)[0];
+		ctx->uidvalidity = ((int *)value.data)[0];
 		ctx->nuid = ((int *)value.data)[1];
 	} else
 #endif
 	{
 		lseek( ctx->uvfd, 0, SEEK_SET );
 		if ((n = read( ctx->uvfd, buf, sizeof(buf) - 1 )) <= 0 ||
-			(buf[n] = 0, sscanf( buf, "%d\n%d", &ctx->gen.uidvalidity, &ctx->nuid ) != 2)) {
+			(buf[n] = 0, sscanf( buf, "%d\n%d", &ctx->uidvalidity, &ctx->nuid ) != 2)) {
 #if 1
 			/* In a generic driver, resetting the UID validity would be the right thing.
 			 * But this would mess up the sync state completely. So better bail out and
@@ -1266,7 +1266,7 @@ maildir_get_box_path( store_t *gctx )
 
 static void
 maildir_open_box( store_t *gctx,
-                  void (*cb)( int sts, void *aux ), void *aux )
+                  void (*cb)( int sts, int uidvalidity, void *aux ), void *aux )
 {
 	maildir_store_t *ctx = (maildir_store_t *)gctx;
 	int ret;
@@ -1279,7 +1279,7 @@ maildir_open_box( store_t *gctx,
 #ifndef USE_DB
 	if ((ctx->uvfd = open( uvpath, O_RDWR|O_CREAT, 0600 )) < 0) {
 		sys_error( "Maildir error: cannot write %s", uvpath );
-		cb( DRV_BOX_BAD, aux );
+		cb( DRV_BOX_BAD, UIDVAL_BAD, aux );
 		return;
 	}
 #else
@@ -1296,7 +1296,7 @@ maildir_open_box( store_t *gctx,
 					goto fnok;
 			}
 			sys_error( "Maildir error: cannot write %s", uvpath );
-			cb( DRV_BOX_BAD, aux );
+			cb( DRV_BOX_BAD, UIDVAL_BAD, aux );
 			return;
 		} else {
 		  dbok:
@@ -1308,7 +1308,7 @@ maildir_open_box( store_t *gctx,
 	ret = maildir_uidval_lock( ctx );
 
   bail:
-	cb( ret, aux );
+	cb( ret, ctx->uidvalidity, aux );
 }
 
 static int
diff --git a/src/sync.c b/src/sync.c
index d2d7ead..b829958 100644
--- a/src/sync.c
+++ b/src/sync.c
@@ -158,6 +158,7 @@ typedef struct {
 	int maxuid[2]; /* highest UID that was already propagated */
 	int newmaxuid[2]; /* highest UID that is currently being propagated */
 	int uidval[2]; /* UID validity value */
+	int newuidval[2]; /* UID validity obtained from driver */
 	int newuid[2]; /* TUID lookup makes sense only for UIDs >= this */
 	int mmaxxuid; /* highest expired UID on master */
 } sync_vars_t;
@@ -962,11 +963,11 @@ delete_state( sync_vars_t *svars )
 	}
 }
 
-static void box_confirmed( int sts, void *aux );
+static void box_confirmed( int sts, int uidvalidity, void *aux );
 static void box_confirmed2( sync_vars_t *svars, int t );
 static void box_deleted( int sts, void *aux );
 static void box_created( int sts, void *aux );
-static void box_opened( int sts, void *aux );
+static void box_opened( int sts, int uidvalidity, void *aux );
 static void box_opened2( sync_vars_t *svars, int t );
 static void load_box( sync_vars_t *svars, int t, int minwuid, int_array_t mexcs );
 
@@ -1002,7 +1003,6 @@ sync_boxes( store_t *ctx[], const char *names[], int present[], channel_conf_t *
 			sync_bail3( svars );
 			return;
 		}
-		ctx[t]->uidvalidity = UIDVAL_BAD;
 		svars->drv[t] = ctx[t]->conf->driver;
 		svars->drv[t]->set_bad_callback( ctx[t], store_bad, AUX );
 	}
@@ -1043,7 +1043,7 @@ sync_boxes( store_t *ctx[], const char *names[], int present[], channel_conf_t *
 }
 
 static void
-box_confirmed( int sts, void *aux )
+box_confirmed( int sts, int uidvalidity, void *aux )
 {
 	DECL_SVARS;
 
@@ -1053,8 +1053,10 @@ box_confirmed( int sts, void *aux )
 	if (check_cancel( svars ))
 		return;
 
-	if (sts == DRV_OK)
+	if (sts == DRV_OK) {
 		svars->state[t] |= ST_PRESENT;
+		svars->newuidval[t] = uidvalidity;
+	}
 	box_confirmed2( svars, t );
 }
 
@@ -1100,7 +1102,7 @@ box_confirmed2( sync_vars_t *svars, int t )
 				svars->drv[1-t]->delete_box( svars->ctx[1-t], box_deleted, INV_AUX );
 			} else {
 				if (!(svars->chan->ops[t] & OP_CREATE)) {
-					box_opened( DRV_BOX_BAD, AUX );
+					box_opened( DRV_BOX_BAD, UIDVAL_BAD, AUX );
 				} else {
 					info( "Creating %s %s...\n", str_ms[t], svars->orig_name[t] );
 					svars->drv[t]->create_box( svars->ctx[t], box_created, AUX );
@@ -1142,7 +1144,7 @@ box_created( int sts, void *aux )
 }
 
 static void
-box_opened( int sts, void *aux )
+box_opened( int sts, int uidvalidity, void *aux )
 {
 	DECL_SVARS;
 
@@ -1158,6 +1160,7 @@ box_opened( int sts, void *aux )
 		svars->ret = SYNC_FAIL;
 		sync_bail( svars );
 	} else {
+		svars->newuidval[t] = uidvalidity;
 		box_opened2( svars, t );
 	}
 }
@@ -1180,13 +1183,13 @@ box_opened2( sync_vars_t *svars, int t )
 
 	fails = 0;
 	for (t = 0; t < 2; t++)
-		if (svars->uidval[t] != UIDVAL_BAD && svars->uidval[t] != ctx[t]->uidvalidity)
+		if (svars->uidval[t] != UIDVAL_BAD && svars->uidval[t] != svars->newuidval[t])
 			fails++;
 	if (fails == 2) {
 		error( "Error: channel %s: UIDVALIDITY of both master and slave changed\n"
 		       "(master got %d, expected %d; slave got %d, expected %d).\n",
 		       svars->chan->name,
-		       ctx[M]->uidvalidity, svars->uidval[M], ctx[S]->uidvalidity, svars->uidval[S] );
+		       svars->newuidval[M], svars->uidval[M], svars->newuidval[S], svars->uidval[S] );
 	  bail:
 		svars->ret = SYNC_FAIL;
 		sync_bail( svars );
@@ -1429,7 +1432,7 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
 		return;
 
 	for (t = 0; t < 2; t++) {
-		if (svars->uidval[t] != UIDVAL_BAD && svars->uidval[t] != svars->ctx[t]->uidvalidity) {
+		if (svars->uidval[t] != UIDVAL_BAD && svars->uidval[t] != svars->newuidval[t]) {
 			unsigned need = 0, got = 0;
 			debug( "trying to re-approve uid validity of %s\n", str_ms[t] );
 			for (srec = svars->srecs; srec; srec = srec->next) {
@@ -1460,7 +1463,7 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
 				error( "Error: channel %s, %s %s: Unable to recover from UIDVALIDITY change\n"
 				       "(got %d, expected %d).\n",
 				       svars->chan->name, str_ms[t], svars->orig_name[t],
-				       svars->ctx[t]->uidvalidity, svars->uidval[t] );
+				       svars->newuidval[t], svars->uidval[t] );
 				goto uvchg;
 			}
 			notice( "Notice: channel %s, %s %s: Recovered from change of UIDVALIDITY.\n",
@@ -1470,8 +1473,8 @@ box_loaded( int sts, message_t *msgs, int total_msgs, int recent_msgs, void *aux
 	}
 
 	if (svars->uidval[M] == UIDVAL_BAD || svars->uidval[S] == UIDVAL_BAD) {
-		svars->uidval[M] = svars->ctx[M]->uidvalidity;
-		svars->uidval[S] = svars->ctx[S]->uidvalidity;
+		svars->uidval[M] = svars->newuidval[M];
+		svars->uidval[S] = svars->newuidval[S];
 		jFprintf( svars, "| %d %d\n", svars->uidval[M], svars->uidval[S] );
 	}