Hi All,
We are looking to decommission Exchange 2010, after migrating all mailboxes to 2013, and I am still seeing a lot of connectivity in the IIS logs to one of the legacy MB servers that has the DBs mounted. I looked at the Outlook Connection Status and see that all the Outlook clients are making RPC connections to that MB server for Exchange Public Folders. My own client shows 28 requests and 3 failures.
We don't use Public Folders at all, but we do show LegacyOutlookSupport on all 2013 and 2010 databases. When I do a Get-OrganizationConfig I see PublicFoldersEnabled : Local. In 2010 there is only the IMP_SUBTREE listed. When Get-publicFolder is run, and in 2013 it reports no active public folders. In 2010, Org Configuration>Mailbox>Database Management Tab there is a LegacyOutlookSupport Public Folder Database listed and mounted to the server showing the RPC connectivity.
Should I follow the steps for removing the last public folder database in this link?: https://technet.microsoft.com/en-us/library/dd876883%28v=exchg.141%29.aspx?f=255&MSPPError=-2147217396
Again, all other DBs in 2010 (which are empty) and 2013 show public folder database as being LegacyOutlookSupport so it makes sense clients are connecting to it.
Note: When I do a Get-PublicFolderStatistics I do see 4 folders listed; 2 of which are Exchange administrative group entries, Organizational Forms Library, and Outlook Security Settings. The one Exchange admin group has 2005 items. Format-List on the command and it shows that that item was SCHEDULE+ Free Busy Information and it expired in 9/2016. The other Exchange Admin Group folder is OFFLINE ADDRESS BOOK. So if I had to guess I would say at one time we had some Public Folders.