If you’re looking for a Global Address List synchronisation solution for Exchange that simply uses Powershell, look no further than this excellent script from fellow MVP Carol Wapshere.
http://www.wapshere.com/missmiis/a-galsync-powershell-script
The script doesn’t leverage the DirSync control (and hence doesn’t use deltas), which means that it isn’t perhaps as efficient as some of the full-blown solutions out there, but it has the beauty of simplicity! Another advantage is that it doesn’t require any expensive infrastructure components – unlike most solutions that need at least one dedicated server and a database.
It also works with a variety of Exchange versions!
The script is likely to be most useful for SMEs during migration scenarios. Larger organisations or those looking for something long-term are more likely to invest in a more comprehensive solution such as FIM, SimpleSync or Quest ActiveRoles QuickConnect.
I encourage you to check it out.
