This issue has been confirmed to occur with Microsoft migrations as well, using the Microsoft Exchange Mailbox Replication Service (MRS) Proxy service.In fact, there has been an open case where a premier customer who has had this issue using MRS (not Migration Wiz) since May 2014.
In some cases, Bit Titan Support has received reports of this issue with OWA, but not Outlook.
Events are changed the same way as appointments or meetings, unless you have an all-day event such as a conference.
Please allow changes to be made to a series of appointments such that the change only affects future occurrences. As it stands now, any changes made to a recurring appointment change all historical instances of that series including any that had been individually modified.
This can cause a lot of confusion when looking back at past appointments for historical record keeping.
Bit Titan Support investigated the issue in lab environments and, after migration from different versions of Exchange Servers (a plain vanilla Exchange Server without any customization), was unable to reproduce the issue using Outlook.
Therefore, if using Outlook and this issue arises, it may be specific to the data migrated, or the environment.
A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book.
She also created video training CDs and online training classes for Microsoft Outlook.
This issue has been reported in organizations with Microsoft Exchange, Outlook (2010, 2013 or 2016), Apple i Phones/i Pads, Active Sync devices, Apple Macs running Outlook 2011 or 2016, and RIM Blackberries.
For more information see: Exchange Outlook Calendaring Problems.
This is an old known issue where calendar events cannot be updated post-migration. This issue is not specific to Migration Wiz; it is a • Outlook, Exchange and Out-of-Date meeting updates that are NOT OUT OF DATE!