I keep getting this error. :
Can't open MAPI MsgStore. The attempt to log on to Microsoft Exchange has failed.

Outlook 2007
Exchange 2003

Please see this MS topic:
http://support.microsoft.com/kb/913843 

Sounds like the same problem.

Hi, WIth Microsoft Outlook 2010, Exchange 2010 and GeniusConnect 5.0.1. I have one calendar failing to load. Error: DynParms warning; CMAPIItems:AllocItems:Can't open MAPI store: Component Microsoft Exchange Information Store Error. The attempt to log on to Microsfot Exchange has failed. LowLevelError 2147942414 Context 1298. Other calendar items have worked. The above KB913843 has been applied. Any other ideas? Thanks.

Hello,

are you in cached mode or online with Exchange? Is it a shared folder and do you have all permissions on it?

Hi,

Thank you for the prompt response!
The error does not depend on Cached or with Owner Permissions. It is a shared foler. Other folders like it are fine, but two folders have raised issues. Please see log below.
Thank you, Chris Chamberlain
INFO:20121128 10:08:41 Outlook changes detected.Saving changes to database...
INFO:20121128 10:08:42 Folder: \\VideoCollab-TX-AN4-C200-9\Calendar
INFO:20121128 10:08:42 Connecting to database: videoconf
INFO:20121128 10:08:42 Connected to database
INFO:20121128 10:08:46 Using file storage:\\(SERVER)\GeniusConnect\Calendar9.gc
ERROR:20121128 10:08:46 Dynamic param error:CMAPIItems::AllocItems:Can't open MAPI MsgStore: Native:MAPI Error: Component Microsoft Exchange Information Store Error The attempt to log on to Microsoft
Exchange has failed. LowLevelError 2147942414 Context 1298
ERROR:20121128 10:08:46 Error Item:000000008E8D7A2A8731E548862048753E207E630700A01CF454F7CE4D4AA6B2AD7EAC225AD2000000395E130000A01CF454F7CE4D4AA6B2AD7EAC225AD2000016FB144C0000 can't find item
ERROR:20121128 10:08:46 Microsoft Outlook:The operation failed.
INFO:20121128 10:08:47 Inserted: P17X Pathfinding
INFO:20121128 10:08:48 Disconnecting from database
INFO:20121128 10:08:49 Disconnected from database. Time Elapsed:0 min. 7 sec. Start:11/28/12 10:08:42

Hi,
So far, a reboot has resolved the issue 4 of 4 times. However, once the error raises for that or for a Server Administrator limited to 250 records at one time, I am unable to continue.
I hope we can resolve this and the 250 records issue.
(P.S. I have performed the Microsoft network adapter fix for the 250 records at one time limit).

Hello,

how many Exchange Accounts and folders are linked to DB?

Hello,

-can you install latest BETA (Close Outlook):
http://support.geniusconnect.com/Posts/t222- 

-run the sync and send us the error message.

I suspect the "Can't open MAPI MsgStore" is related to 250 records limit.

Current 34 calendars. I have a License for 250 calendars, which we will use.

Unfortunately, the issue is still occurring with v.5.0.1.1 BETA5

Is there more error info?

I'm not sure Outlook will be able to load/handle 250 calendars from different accounts in one instance in Online mode.

-are these calendars inside the same account/Store?
-What is the average number of items per folder?
You may need to limit the number of items per folder and archive old items , see this topic:
http://support.geniusconnect.com/Posts/t434- 


You can try to switch your main account to cached mode and load the other mail boxes also in cached mode:

http://support.geniusconnect.com/Posts/t395- 



This will limit the number of open connections to Exchange but you MUST use GeniusConnect Primary Key file storage!
http://support.geniusconnect.com/Posts/t555- 




Please see also these topics (may depend on Exchange version):

http://support.geniusconnect.com/Posts/t511 
http://support.geniusconnect.com/Posts/t470 

Hello GeniusConnect,
Great news! I have resolved my issues and currently uploading the first set of rooms (after attempting on 3 machines and 4 attempts).
The "Can't open MAPI MsgStore. The attempt to log on to Microsoft Exchange has failed." and the 250 record upload limit appears related to a machine OS build problem.
I am now on MS Windows 7 Ent. 64-bit with MS Outlook 2010 64 bit and working offline (though the machine is an Intel Core 2 Duo* currently. I am in Cached Exchanged mode and placing the offline calendar sychronization on a 4 hour schedule. I will increase this to 24 hours after the initial upload. Same with the GeniusConnect database synchonization. I use the Primary Key file storage placed on the database server, which gets backed up monthly/daily/(incrementally).
These calendars are all tied to the same Admin account. The number of items per folder but the uploads are consistent.
I realize the number of calendar folders is challenging Outlook and RAM. My project can add/remove calendar folders if necessary. I will investigate the links in this thread and the macro-enabled upload procedure.
Thank you. Chris Chamberlain

Thanks for the info