Until now, Outlook for Windows solely helps 500 shared folders. One of probably the most requested options from enterprise customers is to extend this restrict in Outlook. Microsoft has lastly determined to do one thing about it. Yesterday, Microsoft introduced that they’re rising this restrict from 500 to 5000! This will allow thousands and thousands of enterprise customers to sync shared mailboxes with out operating into the 500 folder restrict.
Microsoft additionally supplied technical particulars on how they elevated this restrict, learn it under.
Exchange permits for what we name “deep hierarchy” notifications, these will notify the shopper if one thing adjustments inside a given folder subtree. For the first account mailbox, Outlook makes use of this on the root/prime of the mailbox folders to do common sync. We register the notification, Exchange tells us when one thing adjustments, and we sync down the adjustments.
For shared mailboxes nonetheless, this will get trickier. It’s prohibitively costly (efficiency clever) in Exchange to judge entry on a change by change foundation to find out if the registered shopper has entry to the merchandise modified, thus deep hierarchy notifications are solely accessible if you happen to’re the mailbox proprietor. Until now, Outlook would maintain every particular person folder open and register for adjustments in that folder (“shallow” notifications) to study when one thing modified. Pairing this conduct with Exchange’s default limits of 500 MAPI objects open at a time, and we’ve the 500 folder restrict.
Fortunately, once we appeared more durable at our choices we had been capable of finding one other technique of studying that one thing modified within the folder hierarchy – a particular property on the folder that’s up to date when something inside it adjustments. Now we look ahead to adjustments to this property on the shared mailbox, and when detected we’ll work by means of the shared mailbox to sync any adjustments. Voilà! Sync for shared mailboxes with out operating into the 500 folder restrict!
This change is now accessible to Monthly Channel (Targeted) prospects with the April 1904 launch and Monthly Channel prospects with 1905 (11629.20196) and later. Microsoft will roll-out this alteration to Semi-Annual channel prospects on the common SA schedule (September for Targeted and January for common launch.)
