Error Message

If export is done from Vault Admin Console, there are no clear error messages.
If Vault Administrator is using the Enterprise Vault.cloud Archive Migrator, they will receive a "Archive Migrator Service on server  has stopped" message on a screen.
Vault Administrator can identify this issue by Event Log and DTrace like below examples, regardless of which tool is used to export.

Event Log:

Log Name:      Symantec Enterprise Vault
Source:        Enterprise Vault
Date:          12/2/2019 7:09:24 AM
Event ID:      6609
Task Category: Migrator Server
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      EVServer.Example.com
Description:
PST file access error occurred
 
File:  E:\Sample_ENV\20191129_20160117_1F9304831556CF446897DB6036AED055B1110000EVServer1_Export_0091.pst
Account:   EV\vaultadmin
Supplementary Info: Error: 0x8007000E. Could not open the PST file. The file is password protected.

DTrace:

9296446    07:09:23.507     [11768]    (MigratorServer)    <11296>    EV:L    CPSTHelper::OpenPstStore:[E:\Sample_ENV\20191129_20160117_1F9304831556CF446897DB6036AED055B1110000EVServer1_Export_0091.pst]
9296449    07:09:24.537     [11768]    (MigratorServer)    <11296>    EV:H    {CPSTExporter::StartPSTAccess} (Exit) Status: [Exception occurred.  (0x80020009)]
9296450    07:09:24.537     [11768]    (MigratorServer)    <11296>    EV:H    {CADODataAccess::ResetParameters} (Exit) Status: [Exception]
9296451    07:09:24.537     [11768]    (MigratorServer)    <11296>    EV:M    CVaultStoreDB::ScanSavesetByIdPosDateEnd
9296452    07:09:24.538     [11768]    (MigratorServer)    <11296>    EV:L    SingletonRegistry: US '0XD26DC0TransactionContext'
9296453    07:09:24.538     [11768]    (MigratorServer)    <11296>    EV:L    SingletonRegistry: US '0XD26DC01'
9296454    07:09:24.538     [11768]    (MigratorServer)    <11296>    EV:L    SingletonRegistry: US '0XD26DC0'
9296455    07:09:24.539     [11768]    (MigratorServer)    <11296>    EV:H    {CADODataAccess::GetParameterCount} (Exit) Status: [Exception]
9296456    07:09:24.539     [11768]    (MigratorServer)    <11296>    EV:H    {CADODataAccess::DeleteParameter} (Exit) Status: [Exception]
9296457    07:09:24.539     [11768]    (MigratorServer)    <11296>    EV:H    {CADODataAccess::ResetParameters} (Exit) Status: [Exception]
9296458    07:09:24.541     [11768]    (MigratorServer)    <11296>    EV:L    {CVaultStoreEMCCentera::ClearPool} (Entry)
9296459    07:09:24.541     [11768]    (MigratorServer)    <11296>    EV:H    {CVaultStoreEMCCentera::ClearPool} (Exit) Status: [Exception occurred.  (0x80020009)]
9296460    07:09:24.542     [11768]    (MigratorServer)    <11296>    EV:L    {CLogErrBuffer::Log:#56} Entered
9296461    07:09:24.543     [11768]    (MigratorServer)    <11296>    EV~E    Event ID: 6609 PST file access error occurred | |File:  E:\Sample_ENV\20191129_20160117_1F9304831556CF446897DB6036AED055B1110000EVServer1_Export_0091.pst |Account:   EV\vaultadmin |Supplementary Info: Error: 0x8007000E. Could not open the PST file. The file is password protected. |

Temporary Workaround

For the  Vault Administration Console:

Vault Administrator can specify a date range for the items to be exported.
Shortening the date range can alleviate the problem.
This is because the exports will complete before the resources are exhausted.

For the  Enterprise Vault.cloud Archive Migrator:

If Vault Administrator encounter this issue, the exports will be in pause status, but they can resume it by clicking "Start" each time.
And If the amount of data is large, they need to repeat this operation until the exports are completed.

Permanent Solution

This issue has been addressed in the following release:

Enterprise Vault 12.0
https://www.veritas.com/docs/100040245

This issue is due to the wrong behavior of MigratorServer.exe that both Vault Admin Console and Enterprise Vault.cloud Archive Migrator uses during exports.
MigratorServer.exe is a part of Enterprise Vault core installation, and not a part of Enterprise Vault.cloud Archive Migrator tool.
While exporting to PST files from Vault Admin Console, export is executed by MigratorServer.exe directly.
While exporting to PST files from Enterprise Vault.cloud Archive Migrator tool, the same process MigratorServer.exe is also used by use of inter-process calling.
Vault Administrator experience a MigratorServer.exe proccess's stop during exports which causes the issue.
A situation was observed where the MigratorServer.exe did not release the file handle correctly when creating the PST files, that exhaust the file handles until the maximum limit.

Event Log:

DTrace: