[apologies for posting in the Exch 2013 section - the drop down did not show legacy exchange forum categories!]
I recently migrated from Exchange 2003 to 2010. Mailboxes were moved and showing in EMC as 'User Mailbox'. All good.
Now, two weeks later, around 10 of the 60 mailboxes are now showing as 'Shared Mailbox' and I'm not sure why, or how this changed.
There is no pattern to why some users have been converted, they are a mixed bag of staff. I have compared mailbox permissions and send as permissions with 'User Mailbox' types but can't see any difference. The users affected have not reported any issues to me.
What would cause this to happen? I am keen to convert back to User Mailbox type but want to be sure this doesn't happen again.
Thanks