Question : All mailboxes in mailbox store in exchange have disapeared

I have an old and a new exchange server that I have been slowly migrating over time. I attempted to move a users large mailbox last night and noticed that only part moved. So now this user has a mailbox store on the old and new exchange server. After another attempt to move the remaining mailbox store the new exchange server wen't down and I noticed that all the mailboxes in the new exchange servers mailbox store are now missing (panic). Here are some of the event log errors that followed the move:

Event ID:      445
Information Store (1620) First Storage Group: The database C:\Program Files\Exchsrvr\mdbdata\priv1.edb has reached its maximum size of 16383 MB. If the database cannot be restarted, an offline defragmentation may be performed to reduce its size.

Event ID:      1112
The database "First Storage Group\Mailbox Store (GW-EXCH)" has reached the maximum allowed size. Attempting to unmount the database.

Event ID:      8506
Unable to move mailbox Smith, John.
 A problem occurred while getting the properties for a message.

 Internal parent folder ID: 4-2F3A5F; Message ID: 4-3009C2; Error code: Maximum database size reached for database.

 Run ISINTEG to check for any problem in the database "First Storage Group\Mailbox Store (GW-EXCH)".

Event ID:      9172
Failed to copy messages to the destination mailbox store.
Error: The MAPI call failed.
MAPI or an unspecified service provider.
ID no: 80004005-0000-00000000

Event ID:      1203
Failed to delete the mailbox of /O=FIRST ORGANIZATION/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=JSMITH with error Maximum database size reached for database.

Event ID:      1024
Unable to delete a mailbox on 'GW-EXCH'. Result: An internal processing error has occurred. Try restarting the Exchange System Manager or the Microsoft Exchange Information Store service, or both.

Event ID:      1008
Unable to move mailbox 'John Smith.'
Error: The MAPI call failed.
MAPI or an unspecified service provider.
ID no: 80004005-0000-00000000

Event ID:      9175
The MAPI call 'OpenMsgStore' failed with the following error:
The attempt to log on to the Microsoft Exchange Server computer has failed.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0512-00000000

I'm nervous about attempting anything further until I hear from an expert.

Thanks.

Answer : All mailboxes in mailbox store in exchange have disapeared

please mount the database manually and run cleanup agent on server to see the status of the mailboxes

then you would able to see disconnected mailboxes on one server and same mailboxes you might find connected in another server. (You can purge disconnected mailboxes if they are connected on another server after confirming connected one has complete data)

I do agree that you have reached the maximum database limit for exchange 2003 standard edition prior to sp2.

Please upgrade to exchange 2003 sp2 and follow the steps given below (extract of KB 912375) as suggested by demazter.

On the computer that is running Exchange 2003 SP2, click Start, click Run, type regedit, and then click OK.
Click one of the following registry subkeys, as appropriate for the store that you want to increase:
For a mailbox store, click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\Server name\Private-Mailbox Store GUID
For a public folder store, click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\Server name\Public-Public Store GUID
On the Edit menu, point to New, and then click DWORD Value.
In the New Value #1 box, type Database Size Limit in Gb, and then press ENTER.
Right-click Database Size Limit in Gb, and then click Modify.
Click Decimal, and then type an integer from 1 to 75 in the Value data box.