How do I speed up Outlook IMAP sync?

How-to fix slow Outlook IMAP Subscribed Folders Synchronization

1. Select your Inbox.
2. From the menu click Folder > IMAP Folders.
3. Click Query.
4. Select all your IMAP folders.
5. Click Unsubscribe. Outlook may warn you some folders are ‘special’. Click OK if this warning appears.
6. Click OK.
7. Close and re-open Outlook.
8. Select your Inbox.

Why does Outlook take so long to download emails?

If your PST data file is full, fragmented, damaged, the process of downloading email into a PST file may take time. So, it is your Microsoft Outlook trying to download and write the received email into the faulty PST data file. This might be the reason why you’re facing a delay in receiving emails in Outlook account.

Why is IMAP so slow?

IMAP is slow. IMAP in general is fast but you can mess with it to make it slow. So having 10,000+ (even 1,000+) in one folder (Inbox is a folder) slows it down to make it nearly unusable. To get around this you have to organize your mails in folders and subfolders.

Why is Outlook taking forever to sync?

Your Outlook email client has to download all the emails, folders and contents to your local computer, so depending on your internet connection speed, especially if it’s slow, syncing can take a while as the sync process is resource-intensive.

Why does Outlook sync take so long?

When you have many folders with many messages in Microsoft Outlook, synchronization can be slow or even appear to hang. Outlook hangs because it downloads all messages every time, including attachments, while with a regular email IMAP application, only headers are being synced.

How do I download all emails from IMAP?

You need to configure Outlook to download the complete email, not just the header. To make the change, you must open the Send/Receive Settings dialog box in Outlook, select your IMAP account, and then select “Download complete item including attachments” in the Folder Options section.

Why does it take so long for my emails to come through?

Email delays can be attributed to the size of the email and its attachments, network latency, or occasionally issues with spam/virus scanners getting backed up. Most often, it’s a case of sender or recipient client delays. Many mail clients only communicate with the server to send or receive new mail every few minutes.

Why does synchronizing folders in Outlook take so long?

How do I fix synchronization in Outlook 2013?

Methods to Resolve IMAP Sync Issue in Outlook 2019, 2016, or 2013

1. Method 1: Check Network Connection.
2. Method 2: Create a New Outlook Profile.
3. Method 3: Change the Root Folder Path for an IMAP account.
4. Method 4: Subscribe Folders.
5. Method 5: Rebuild Outlook Data File (OST)