Increase microsoft outlook support for mail box more than 100GB

Question

Increase microsoft outlook support for mail box more than 100GB

Niraj Shah 1

My mailbox size is more than 100GB where outlook is supporting only 50GB. Now My mail sync through google exhcange is stopped. I have tried IMAP config but same issue.

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Answer 1

Faery Fu-MSFT 19,751 Moderator

Hi @Niraj Shah ,

Based on your description, are you referring to the size limit of the data files in the Outlook client?
Did you encounter any specific error message?

If you meant the size limit of Outlook data files, as far as I know, in Outlook 2010, 2013, 2016, 2019 and Microsoft 365, this limit is set to 50GB.

Based on my search, you can increase the limit via the registry to manage the Outlook data files size.
Important: Follow the following steps carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

To modify the registry, here is an document for reference: https://www.msoutlook.info/question/large-exchange-mailboxes-and-the-ost-file-size-limit
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

Step 1: Press ‘Windows’ and ‘R’ keys together to open the Run dialog box
Step 2: In the Run dialog box, type registry and press Enter
Expand the registry key due to your Outlook version:

Step 3: Create the following 2 new DWORD values.

In addition, I also found a document which introduces several ways to clean up items in the mailbox and how to manually compact the OST file after deleting items.
If you have an Exchange or IMAP account, it is recommended to modify the offline settings to reduce the offline emails.
File> Account Settings> Account Settings>select your account>Change> move the Sync Slider below: mail to keep offline.

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Niraj Shah 1 Reputation point

2021-11-09T05:32:19.467+00:00

Thank you helping me out. I tried solution but unable to sync more than 48 GB. I have set outlook profile in MAPI throught Google Sync.

Kindly help me if any other alternative.
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-09T08:07:09.833+00:00

Hi @Niraj Shah ，

Thank you for your update, can you tell me the two DWORD values you set? (Note: please hide your personal information)
For example, if you want to set the maximum size to100GB and warning at 95GB, you can refer to the following steps:

Step1: Find the location of PST in the registry:

Step2: Right-Click the DWORD and modify the values

If the issue still continues, could you share the error message you met for further analysis?
Niraj Shah 1 Reputation point

2021-11-09T08:16:20.913+00:00

Hi,
I am set following values.

I have set following values,
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-11T05:14:49.167+00:00

Hi @Niraj Shah ,

As mentioned earlier, is there any error message when the issue occurs? If yes, could you remove all personal information involved and then share the exact error message or a screenshot of the error so that we can understand better about the situation?

Besides, as regards to the registry method, please try to set the maximum size to 100GB and warning value at 95GB as follows to check the result:
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-16T07:04:48.793+00:00

Hi，@Niraj Shah ，
Does this issue have any updates? If you have any questions or need further assistance, please feel free to post back. Thanks!
Niraj Shah 1 Reputation point

2021-11-16T07:09:06.003+00:00

Hi,
Issue is not resolved now. I have disucssed with my IT team & coming to conclusion that needs to update Group policy & its registry to make this changes available.

In the registry, I am not able to open user registry.

I am not sure conclusion is correct or not.

Please feel to assist me in this matter.
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-16T08:12:04.867+00:00

Hi @ NirajShah-3995 ,

In the registry, I am not able to open user registry.

Could you please tell me what specific problem you encountered?
Niraj Shah 1 Reputation point

2021-11-16T09:06:27.667+00:00

Hi,
After updating regisrty, it is not taking more than 48GB. When I checked with my IT team, they told me that due to group policy, your registry values are not getting affected.

I am not sure, it will affect group policy or not.

What's your point of view. Group policy will affect this?
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-17T09:36:51.063+00:00

Hi @Niraj Shah ,

What's your point of view. Group policy will affect this?

As far as I know, yes, group policy settings take precedence over the change in local registry values.

Please check if there are entries for the maximum value and warning value in the registry policy path below and see if it can be modified into a larger value:
(Important: Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.)
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\X.0\Outlook\PST

If there is no entry in this path or it still doesn’t work, you may need to contact your IT team to see if they can change the group policy settings for you.
Niraj Shah 1 Reputation point

2021-11-17T09:53:29.647+00:00

Hi,
Said path is not available in my registry. I have connected my IT team & they will check on Group policy side.
Faery Fu-MSFT 19,751 Reputation points Moderator

2021-11-22T01:15:28.267+00:00

Hi @Niraj Shah ,
Does this issue have any updates? If you have any questions or need further assistance, please feel free to post back. Thanks!

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Increase microsoft outlook support for mail box more than 100GB

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