--- a/mod_migrate/mod_migrate.lua	Sat Dec 19 11:45:39 2015 +0100
+++ b/mod_migrate/mod_migrate.lua	Sat Dec 19 14:03:21 2015 +0100
@@ -5,55 +5,57 @@
 local mm = require"core.modulemanager";
 
 function module.command(arg)
-	local host, source_store, migrate_to, user = unpack(arg);
+	local host, source_stores, migrate_to, user = unpack(arg);
 	if not migrate_to then
 		return print("Usage: prosodyctl mod_migrate example.com <source-store>[-<store-type>] <target-driver> [users]*");
 	end
 	sm.initialize_host(host);
 	um.initialize_host(host);
 	local module = module:context(host);
-	local store_type = source_store:match("%-(%a+)$");
-	if store_type then
-		source_store = source_store:sub(1, -2-#store_type);
-	end
-	local storage = module:open_store(source_store, store_type);
-	local target = assert(sm.load_driver(host, migrate_to));
-	target = assert(target:open(source_store, store_type));
+	for source_store in source_stores:gmatch("[^,]+") do
+		local store_type = source_store:match("%-(%a+)$");
+		if store_type then
+			source_store = source_store:sub(1, -2-#store_type);
+		end
+		local storage = module:open_store(source_store, store_type);
+		local target = assert(sm.load_driver(host, migrate_to));
+		target = assert(target:open(source_store, store_type));
 
-	local function migrate_user(username)
-		module:log("info", "Migrating data for %s", username);
-		local data, err = storage:get(username);
-		assert(data or err==nil, err);
-		assert(target:set(username, data));
-	end
+		local function migrate_user(username)
+			module:log("info", "Migrating data for %s", username);
+			local data, err = storage:get(username);
+			assert(data or err==nil, err);
+			assert(target:set(username, data));
+		end
 
-	if store_type == "archive" then
-		function migrate_user(username)
-			module:log("info", "Migrating archive items for %s", username);
-			local count, errs = 0, 0;
-			for id, item, when, with in storage:find(username) do
-				local ok, err = target:append(username, id, item, when, with);
-				if ok then
-					count = count + 1;
-				else
-					module:log("warn", "Error: %s", err);
-					errs = errs + 1;
+		if store_type == "archive" then
+			function migrate_user(username)
+				module:log("info", "Migrating archive items for %s", username);
+				local count, errs = 0, 0;
+				for id, item, when, with in storage:find(username) do
+					local ok, err = target:append(username, id, item, when, with);
+					if ok then
+						count = count + 1;
+					else
+						module:log("warn", "Error: %s", err);
+						errs = errs + 1;
+					end
+					if ( count + errs ) % 100 == 0 then
+						module:log("info", "%d items migrated, %d errors", count, errs);
+					end
 				end
-				if ( count + errs ) % 100 == 0 then
-					module:log("info", "%d items migrated, %d errors", count, errs);
-				end
+				module:log("info", "%d items migrated, %d errors", count, errs);
 			end
-			module:log("info", "%d items migrated, %d errors", count, errs);
 		end
-	end
 
-	if arg[4] then
-		for i = 4, #arg do
-			migrate_user(arg[i]);
-		end
-	else
-		for user in um.users(host) do
-			migrate_user(user);
+		if arg[4] then
+			for i = 4, #arg do
+				migrate_user(arg[i]);
+			end
+		else
+			for user in um.users(host) do
+				migrate_user(user);
+			end
 		end
 	end
 end