After setting up archiving, are users able to access their archived mailbox from their mobile phones witch active sync? Also does Outlook create OST files for archived mailboxes? Any other possible gotchas with archived mailboxes?

Thanks for any input!

I don't think the online archive is available through ActiveSync.  The online archive is not synchronized to the OST, which is why it's called the "online archive", and that's a good thing because one of the reasons for it is to keep the primary mailbox smaller so that caching it less of a burden on the workstation resources.

Hi,

As Ed mentioned, heres an article about In-Place Archiving in Exchange 2013:
https://technet.microsoft.com/en-us/library/dd979800(v=exchg.150).aspx

Thanks