Office Performance Issues

How to Fix Outlook Opening Slowly Because of Adobe Acrobat

Olivia Miller Oct 23, 2026 869 views

Question details

Users experience significant lag or delayed startup in Microsoft Outlook after installing or updating Adobe Acrobat, commonly caused by add-in conflicts.

How to Fix Outlook Opening Slowly Due to Adobe Acrobat

Product: Microsoft Outlook and Adobe Acrobat
Device & OS: not provided
Scenario: Launching Microsoft Outlook after a recent Adobe Acrobat installation or update.
Observed behavior: Microsoft Outlook takes an unusually long time to open, hangs on the loading screen, or freezes temporarily during startup.

Before you start

Ensure you have saved all active drafts and completely closed both Microsoft Outlook and Adobe Acrobat before applying these fixes.

Solution 1Recommended

Disable the Acrobat PDFMaker Add-in in Outlook

Disabling the Adobe Acrobat COM Add-in prevents Outlook from syncing PDF features at launch, which is the most common cause of startup delays.

When Adobe Acrobat is installed, it automatically adds a PDFMaker extension to Microsoft Office applications. If this add-in becomes corrupted or conflicts with Outlook's processes, it severely slows down the application's launch time.

Launch Outlook in Safe Mode

Press the Windows Key + R to open the Run dialog. Type 'outlook.exe /safe' and press Enter. This opens Outlook without loading any external add-ins.

Access Add-in Settings

Click on 'File' in the top-left corner, select 'Options', and then navigate to the 'Add-ins' tab on the left sidebar.

Manage COM Add-ins

At the bottom of the window, ensure 'COM Add-ins' is selected in the 'Manage' drop-down menu and click the 'Go...' button.

Disable the Acrobat Add-in

Find 'Acrobat PDFMaker Office COM Addin' in the list, uncheck the box next to it, and click 'OK'. Restart Outlook normally to see if the speed has improved.

Disable the Acrobat PDFMaker Add-in in Outlook

PDF Functionality: Disabling this add-in only removes the 'Save as Adobe PDF' ribbon tool. You will still be able to open, view, and save PDF attachments normally.

Solution 2

Update Both Outlook and Acrobat to the Latest Versions

Installing the latest updates for both applications can resolve known bugs and performance conflicts recognized by Microsoft and Adobe.

Solution 3

Repair or Reinstall Adobe Acrobat

If updating doesn't work, the Acrobat installation files might be corrupted. Running a repair or reinstalling the software can rebuild the necessary integration files correctly.

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Frequently Asked Questions

Why does Adobe Acrobat slow down Microsoft Outlook?

When installed, Adobe Acrobat adds a 'PDFMaker' COM add-in to Microsoft Office programs. Outlook attempts to load and verify this add-in every time it launches. If the add-in is outdated, corrupted, or conflicting with other processes, it significantly delays Outlook's startup time.

How do I check if other add-ins are causing Outlook to open slowly?

You can isolate add-in issues by launching Outlook in Safe Mode (press Win + R, type 'outlook.exe /safe'). If Outlook opens instantly, an add-in is likely the culprit. You can then go to File > Options > Add-ins > Manage COM Add-ins to disable them one by one until you identify the problematic extension.

Can I still create PDFs from emails if I disable the Acrobat add-in?

Disabling the Acrobat COM add-in removes the dedicated Adobe PDF buttons from the Outlook ribbon. However, you can still save emails as PDFs by using Microsoft's native 'Print to PDF' feature. Simply go to File > Print, and select 'Microsoft Print to PDF' as your printer.

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