This is what I see when using Locate / Collect / Migrate (note: Server Wizard migration won't expand the quota)
So this is what I see happening on my machine:
First of all we see all the archiving of the items, then we go into:
849819 14:13:41.897 [3592] (MigratorServer) <5884> EV:M CMigrator::MovePstToMbx has started
And we then get to this part:
849906 14:13:57.080 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::GetEx2KUserQuotaValues} (Entry)
849907 14:13:57.080 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::GetEx2KUserQuotaValues}|Active Directory DN of the users mailbox: CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local|active directory distinguished name of the users message store:CN=Mailbox Database 0404355107,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ev,DC=local|
849908 14:13:57.081 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::GetEx2KUserQuotaValues}|Binding using the following: GC://dc.ev.local/CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local
849909 14:14:01.616 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::GetEx2KUserQuotaValues} (Exit) Status: [Success]
849910 14:14:01.616 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::OpenMailboxMsgStore} (Exit) Status: [Success]
849911 14:14:01.616 [3592] (MigratorServer) <5884> EV:L {CMigrator::GetPstQuotaSize} (Entry)
849912 14:14:01.617 [3592] (MigratorServer) <5884> EV:M PST quota sizing has started
We then go through all the shortcuts to find out their sizes, and work out whether we have to add some on to the quota:
Eg lots of this:
849931 14:14:01.651 [3592] (MigratorServer) <5884> EV:M Sizing item titled : 1
849932 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::CheckJobState} (Entry)
849933 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::CheckJobState} (Exit)
849934 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::isEligibleForMove} (Entry)
849935 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::ValidCodepage} (Entry)
849936 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::ValidCodepage} (Exit)
849937 14:14:01.651 [3592] (MigratorServer) <5884> EV:L {CMigrator::isEligibleForMove} (Exit)
849938 14:14:01.651 [3592] (MigratorServer) <5884> EV:M Sizing item titled : 50
853447 14:14:01.759 [3592] (MigratorServer) <5884> EV:M PST quota sizing has finished
853448 14:14:01.759 [3592] (MigratorServer) <5884> EV:L {CMigrator::GetPstQuotaSize} (Exit) Status: [Success]
853449 14:14:01.759 [3592] (MigratorServer) <5884> EV:L {SanitizeUserName:#906} [/o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=Adele.Reinhardt] encoded to [/o=First Organization/ou=Exchange Administrative Group \28FYDIBOHF23SPDLT\29/cn=Recipients/cn=Adele.Reinhardt] for LDAP or ADSI query.
853450 14:14:01.759 [3592] (MigratorServer) <5884> EV:M FindUser() - Using searchbase GC://dc.ev.local
853453 14:14:10.870 [3592] (MigratorServer) <5884> EV:M FindUser() - Search filter: (&(objectCategory=user)(legacyExchangeDN=/o=First Organization/ou=Exchange Administrative Group \28FYDIBOHF23SPDLT\29/cn=Recipients/cn=Adele.Reinhardt))
853454 14:14:10.871 [3592] (MigratorServer) <5884> EV:M FindUser() - [homeMDB] = CN=Mailbox Database 0404355107,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ev,DC=local
853455 14:14:10.871 [3592] (MigratorServer) <5884> EV:M FindUser() - [distinguishedName] = CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local
853456 14:14:10.872 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::GetEx2KUserQuotaValues} (Entry)
853457 14:14:10.872 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::GetEx2KUserQuotaValues}|Active Directory DN of the users mailbox: CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local|active directory distinguished name of the users message store:CN=Mailbox Database 0404355107,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ev,DC=local|
853458 14:14:10.873 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::GetEx2KUserQuotaValues}|Binding using the following: GC://dc.ev.local/CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local
853461 14:14:15.390 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::GetEx2KUserQuotaValues} (Exit) Status: [Success]
853462 14:14:15.390 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::SetEx2KUserQuotaValues} (Entry)
853463 14:14:15.391 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::SetEx2KUserQuotaValues}|Active Directory DN of the users mailbox: CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local|active directory distinguished name of the users message store:CN=Mailbox Database 0404355107,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ev,DC=local|
853464 14:14:15.391 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::SetEx2KUserQuotaValues}|Binding using the following: LDAP://dc.ev.local/CN=Adele.Reinhardt,OU=OfficeUsers,DC=ev,DC=local
853471 14:14:19.925 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::SetEx2KUserQuotaValues}|Setting [mDBOverHardQuotaLimit] to 50248
853472 14:14:19.933 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::SetEx2KUserQuotaValues}|Setting [mDBOverQuotaLimit] to 49224
853473 14:14:19.933 [3592] (MigratorServer) <5884> EV:H {CMailboxHandler::SetEx2KUserQuotaValues}|Setting [mDBStorageQuota] to 48200
853474 14:14:20.010 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::SetEx2KUserQuotaValues} (Exit) Status: [Success]
853475 14:14:20.011 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::OpenMailboxMigratedItemsFolder} (Entry)
853476 14:14:20.011 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::OpenMailboxIPMFolder} (Entry)
853477 14:14:20.015 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::OpenMailboxIPMFolder} (Exit) Status: [Success]
853478 14:14:20.015 [3592] (MigratorServer) <5884> EV:M {CMailboxHandler::OpenMailboxMigratedItemsFolder}|Opening Migrated Items folder: xyz|
853479 14:14:20.123 [3592] (MigratorServer) <5884> EV:M {SetFolderContainerClass:#4135} Setting container class to [偉⹆潎整]
853480 14:14:20.157 [3592] (MigratorServer) <5884> EV:M {SetFolderContainerClass:#4135} Setting container class to [偉⹆潎整]
853481 14:14:20.176 [3592] (MigratorServer) <5884> EV:L {CMailboxHandler::OpenMailboxMigratedItemsFolder} (Exit) Status: [Success]
853482 14:14:21.301 [3592] (MigratorServer) <5884> EV:M CMigrator::MovePstToMbx() - CreateHiddenMessage() for the new Migrate To MAPI folder returned [0x00000000]|
853483 14:14:21.306 [3592] (MigratorServer) <5884> EV:L {CMigrator::MergedMovePstToMbx} (Entry)
853484 14:14:21.306 [3592] (MigratorServer) <5884> EV:M Move items to mailbox has started
Hope that helps,