关于Webex访问Outlook .ost邮件文件的权限疑问及权限限制诉求

Great question—let’s break this down clearly, starting with why Webex might be touching your Outlook .ost file, then walking through how to lock its permissions down to only what it needs for core functionality.

Why Webex accesses the .ost file #

The .ost file is Outlook’s offline data store, holding all your emails, calendar events, contacts, and other mailbox data. Webex typically accesses this for optional integration features, not core calling/video functionality:

• If you’ve set up Webex to sync with your Outlook calendar, it needs to read calendar events to auto-join meetings, populate meeting details, or send reminders directly through the app.
• It might also pull Outlook contacts to let you quickly invite people to Webex calls without manually typing email addresses.

How to limit Webex to essential permissions (keyboard, webcam, mic) #

Here are practical steps to restrict Webex to only the resources it needs:

• Tweak Windows app permissions
  Go to Windows Settings > Apps > Apps & features, find Webex, click "Advanced options". Under the "Permissions" section, toggle off access to "Email", "Contacts", and any other non-essential permissions. Leave "Microphone", "Camera", and "Input" (for keyboard) enabled.

• Turn off Outlook integration in Webex
  Open the Webex desktop app, click your profile icon in the top-right to access settings, then navigate to the "Calendar" or "Integrations" tab. Find the Outlook sync option and disable it—this will stop Webex from accessing your .ost file entirely.

• Check Outlook’s Trust Center settings
  Open Outlook, go to File > Options > Trust Center > Trust Center Settings. Look for any Webex-related add-ins or permissions that allow access to mailbox data, and disable them to add an extra layer of control.

• Use Webex in your browser
  If you don’t need the full desktop app feature set, the web version of Webex only requests permissions for webcam, mic, and keyboard when you start a call—no background access to local files like .ost.

备注：内容来源于stack exchange，提问作者Boppity Bop