Event 1006, MsExchange Mailbox Replication

Hi All,

I've installed Ms Exchange 2010 with SP1 in Windows Server 2008 R2 SP1 x64. The CAS+HT Role in a host and Mailbox Role in another host. Everything is working fine for a month then problems arised.

For the last few days i've encountered event 1006, MsExchange Mailbox Replication with below details :

The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.

Database: Mailbox Database 2058730175
Error: MapiExceptionMaxThreadsPerMdbExceeded: Unable to open message store. (hr=0x80004005, ec=2700)
Diagnostic context:
    ......
    Lid: 1750    ---- Remote Context End ----
    Lid: 23354   StoreEc: 0xA8C     
    Lid: 55847   EMSMDBPOOL.EcPoolSessionDoRpc called [length=235]
    Lid: 43559   EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0xA8C][length=226][latency=0]
    Lid: 32881   StoreEc: 0xA8C     
    Lid: 50035  
    Lid: 64625   StoreEc: 0xA8C     
    Lid: 1494    ---- Remote Context Beg ----
    Lid: 26426   ROP: ropLogon [254]
    Lid: 52223   dwParam: 0x33
    Lid: 60415   dwParam: 0x32
    Lid: 46079   StoreEc: 0xA8C     
    Lid: 40271  
    Lid: 12716   StoreEc: 0xA8C     
    Lid: 20794  
    Lid: 28474   StoreEc: 0xA8C     
    Lid: 22330   dwParam: 0x0        Msg: 14.01.0218.015:SVEXCMDN02
    Lid: 1750    ---- Remote Context End ----
    Lid: 23354   StoreEc: 0xA8C     
    Lid: 55847   EMSMDBPOOL.EcPoolSessionDoRpc called [length=235]
    Lid: 43559   EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0xA8C][length=226][latency=0]
    Lid: 32881   StoreEc: 0xA8C     
    Lid: 50035  
    Lid: 64625   StoreEc: 0xA8C     
    Lid: 1494    ---- Remote Context Beg ----
    Lid: 26426   ROP: ropLogon [254]
    Lid: 52223   dwParam: 0x33
    Lid: 60415   dwParam: 0x32
    Lid: 46079   StoreEc: 0xA8C     
    Lid: 40271  
    Lid: 12716   StoreEc: 0xA8C     
    Lid: 20794  
    Lid: 28474   StoreEc: 0xA8C     
    Lid: 22330   dwParam: 0x0        Msg: 14.01.0218.015:SVEXCMDN02
    Lid: 1750    ---- Remote Context End ----
    Lid: 23354   StoreEc: 0xA8C     
    Lid: 25913  
    Lid: 21817   ROP Failure: 0xA8C     
    Lid: 26297  
    Lid: 16585   StoreEc: 0xA8C     
    Lid: 32441  
    Lid: 1706    StoreEc: 0xA8C     
    Lid: 24761  
    Lid: 20665   StoreEc: 0xA8C     
    Lid: 25785  
    Lid: 29881   StoreEc: 0xA8C     

after that, Ms Exchange not working anymore.

I had to restart both server ( CAS/HT and Mailbox ) to get Exchange working normal again, but in several hours it would happened again. I've already tried to search forums but still no luck till now. 

Any hint on what i had to check ? Thanks before. Sorry for my bad english.

Regards,

George