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36 = 3 years of email items (Outlook 2016 only).

Replace “xx.0” with the appropriate number for your version of Outlook:Ĭreate a DWORD value of SyncWindowSetting, and then set the desired value: The registry key used is HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\xx.0\Outlook\Cached Mode. If Group Policy is not available, you can use the registry to configure the Outlook cached mode slider. Group Policy settings for managing the Outlook cached mode slider The Office 2016 administrative templates are available here.

#Microsoft outlook 2016 email setup going inti 2 data files download#

You will need to download the Group Policy administrative templates for your version of Office. The slider can be configured using Group Policy.

Hard drives 64GB and larger, default to 12 months.

Hard drives bigger than 32GB, but less than 64 GB, default to 3 months.

Hard drives up to 32Gb in size, default to 1 month.

The slider’s default setting depends on size of the hard disk in your computer. Instead it allows you to select how much data is downloaded from your mailbox by age. The Outlook cached mode slider does not directly control the size of your OST file in gigabytes. The Outlook cached mode slider, managed by Group Policy There you’ll see the slider, which is shown in the screenshot below.

In Outlook, go to File -> Account Settings, then highlight the account and click the Change button. The OST slider allows you to control how much of your mailbox data is cached to your computer’s hard drive. Before this feature was developed, caching a mailbox in Outlook was an all or nothing proposition. With Outlook 2013 they introduced the cached mode slider, also sometimes referred to as the OST slider. With the large mailbox quotas for Exchange Online mailboxes, Microsoft thought it prudent to implement a method for partial caching of mailboxes.

#Microsoft outlook 2016 email setup going inti 2 data files how to#

How to Manage OST File Sizes Using the Outlook Cached Mode Slider Rebuilding the OST file for a large mailbox can take a long time, and the user has a degraded experience while the rebuild is occurring.īut there are solutions so that you can avoid those issues. Recovering from OST file corruption means deleting the file, and then allowing Outlook to download the mailbox contents to a new OST file. Large OST files are also prone to corruption. New mail won’t appear in Outlook, and they will be unable to move existing mail between folders. In fact, if the Outlook cache grows to the maximum file size, the user will begin to see problems. Can an OST file hold all the data in a 100GB mailbox? No, it can’t. With the huge size of mailboxes possible in Exchange Online and Exchange on-premises, the size limit of OST files is a problem. Today, Outlook will use the Unicode file format by default. The older ANSI format has an OST file size limit of only 2GB. The limits above apply to OST files in Unicode format, also known as “Large format”.

#Microsoft outlook 2016 email setup going inti 2 data files upgrade#

Outlook 2010 is also out of mainstream support, so hopefully if you are still running Outlook 2010 you are planning an upgrade in the near future.

Hopefully you’re not running Outlook 2007 or 2003, both of which are unsupported today.

Outlook 20 and earlier support an OST file size of up to twenty gigabytes (20GB).

Outlook 2010 and later support an OST file size of up to fifty gigabytes (50GB).

The OST file format has a maximum file size that depends on the version of Outlook you’re running:

#Microsoft outlook 2016 email setup going inti 2 data files Offline#

OST files are Outlook offline data files. Outlook’s local cache of mailbox data is stored in a file format known as an OST file. When they reconnect to a network, their emails are sent, and any new emails are downloaded for them to read. Users can read and compose emails without network connectivity, such as when traveling. Second, Outlook cached mode allows users to work with mailbox data while offline. They use Outlook over slow networks such as home internet connections and public Wi-Fi. Users connect to their mailbox over longer distances. These days, Exchange mailboxes are hosted on servers on centralized datacenters, or in the cloud in Office 365. In the old days, when Outlook was primarily used to connect to Exchange servers that were close to the end user, on-line mode was good enough. Outlook performance in “on-line mode” is not all that great. When you connect Outlook to an Exchange account, Outlook downloads a copy of your mailbox content to a local cache.

How to Manage OST File Sizes Using the Registry.

How to Manage OST File Sizes Using the Outlook Cached Mode Slider.