I am getting more and more requests for MAPI and ActiveSync when using the new versions of Outook as customers want that O365 capability like being on Exchange. This is also part of the marketing of SmarterMail BTW.
ActiveSync generally works great and does not have any issues with Autodiscover plus I can easily perform a Manual Setup to override AutoDiscover. However, some versions of Exchange support in gMail for various Android platforms could be better. I am thinking about looking at eM Client.
The issue for me is older (I am on Build 8025) versions SmarterMail are not compatible with the latest Outlook that is part of Microsoft 365. Now the latest Build 8538 appears to work but has some teething issues as the MAPI has been updated. I am confident that SmarterMail will get this all worked out, however, my +40 domain customers on my Shared SmarterMail don't want to hear about teething issues.
I am eyeing upgrading to Build 8451 (Feb 20, 2023) and Build 8251 (Aug 4, 2022).
Moreover, Microsoft insists that the Autodiscover FQDN matches the FQDN if the MRS IIS Web Site for autodiscover.<customer-domain>, for <customer-domain>/autodiscover/autodiscover.xml and then you have the DNS SRV record which seems to want autodiscover.<customer-domain>.
How are Shared Hosters dealing with this issue? We don't seem to have any documentation? What about setting a dedicated MRS IIS on the same SmarterMail Server for each client so that autodiscover works correctly for MAPI?
Does anyone have solutions or recommendations for me on a)solve the autodiscover issue and b) BUILD Version.