This issue occurs for multiple reasons, and in certain scenarios, it is the expected behavior. Lync generally prompts you for credentials only after you're signed in and when it must connect to an external service such as the Microsoft Exchange Free/Busy service or the Exchange Calendar service.
Lync for Mac 2011 (versions 14.0.5 - 14.0.7) crashes on startup for some users. This behavior is noted for existing users and is not fixed by re-installing Lync. Lync may work by logging in as a different user on the same machine.
The steps to fix are simple and involve deleting a few files and keychain entries.
9 Steps total
Step 1: Close Lync
Press COMMAND-Q to ensure that Lync is fully closed.
Step 2: Open Users /Library Folder.
Open a Finder Window then click Go on the top menu.
Hold down the OPTION key and click on Library.
Step 3: Navigate to /Library/Preferences
Delete the following file:
/Library/Preferences/com.microsoft.Lync.plist
Step 4: Navigate to /Library/Preferences/ByHost
Delete the following file:
/Library/Preferences/ByHost/MicrosoftLyncRegistrationDB.xxxx.plist
Step 5: Close the Finder Window
Remove microsoft office belongs to mac. Close Finder as it's not needed anymore.
Step 6: Open Keychain Access
Located in the /Applications/Utilities folder.
Step 7: Delete Keychains
Delete any keychains on the left that look similar to this:
OC__KeyContainer__.
In your Login keychain, delete certificate.
Step 8: Close Keychain Access
Close Keychain Access as it's not needed anymore.
Step 9: Re-Open Lync
Lync does not need to be re-installed. Re-open Lync and complete the user setup wizard. If Lync continues to crash it may need to be re-installed.
If the preceding steps do not correct the issue, use the article below to completely uninstall Lync for Mac. Reboot after un-installing and re-install Lync.
References
- Removing Lync for Mac 2011
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-->Problem
After you successfully sign in to Skype for Business Online (formerly Lync Online) by using Lync 2010 or Lync 2013, you may experience the following issues: https://flashomg.netlify.app/share-microsoft-office-between-users-mac.html.
You receive a message in Lync that says it cannot connect to Exchange.
You're repeatedly prompted to provide a user name and a password to connect to Exchange.
You may also receive the following message: Credentials are required
Note
Lync Client For Mac
The message that you receive may vary, depending on which service Lync is trying to connect to. You may be prompted for credentials when Lync tries to connect to any of the following services:
- Calendar and Free/Busy information from Outlook
- Exchange Web Services (EWS)
- Response Group Service
- Address Book Service
Solution
This issue occurs for multiple reasons, and in certain scenarios, it is the expected behavior. Lync generally prompts you for credentials only after you're signed in and when it must connect to an external service such as the Microsoft Exchange Free/Busy service or the Exchange Calendar service. If Lync continues to prompt you for credentials after it has done this several times, there's probably an issue with Outlook or with the Exchange services.
Solutions for Lync users
If a firewall or a proxy is blocking Lync from connecting to EWS, you may experience symptoms such as repeated credential requests, stale Address Book Service (ABS), and intermittent Free/Busy presence issues. To resolve this problem, verify that the user has the correct proxy configured in Internet Explorer. To do this, follow these steps:
- Start Internet Explorer.
- On the Tools menu, click Internet Options, click Connections, and then click LAN Settings.
- Make sure that the Automatically detect settings option is selected. If your organization requires you to enter specific information for the proxy server or an automatic configuration script, contact your network administrator.
- Restart both Internet Explorer and Lync to check whether the problem is resolved. If the problem persists, go on to the next section.
Lync can't connect to Outlook or EWS
If Lync doesn't integrate automatically with Outlook, Lync prompts you for credentials before it lets you connect to Outlook to retrieve Calendar and Free/Busy information. If you are prompted repeatedly after you enter your credentials, see the following Microsoft Knowledge Base article:
2436962 'There was a problem connecting to Microsoft Office Outlook' error when you sign in to Skype for Business Online
If Lync doesn't automatically connect to EWS, Lync prompts you for credentials before it lets you access the EWS URLs. If you are still prompted after you enter your credentials, see the following Microsoft Knowledge Base article:
2787614 Conversation history, contact cards, Free/Busy, and Out of Office information are unavailable when Lync fails to connect to Exchange
If you're repeatedly prompted to enter your credentials or receive the 'Access Denied' error message, see the following Microsoft Knowledge Base article:
2630976 'Access Denied' error, or user is repeatedly prompted for credentials when trying to connect to Office 365 by using a rich client application
Solutions for Lync administrators
Lync can’t connect to Outlook or EWS
If the Exchange server or EWS is unavailable, this causes Lync to continuously prompt for credentials because it can't contact Exchange for authentication. To resolve this issue, verify that Outlook has connectivity to the mailbox. If Outlook can't connect to Exchange, troubleshoot the issue as an Exchange connectivity issue. For more information, see the following Microsoft Knowledge Base article:
2787614 Conversation history, contact cards, Free/Busy, and Out of Office information are unavailable when Lync fails to connect to Exchange
Click Get Started to start activating. Microsoft office download student mac. Click Close when the installation is finished. If Office installation fails, see.Launch an Office for Mac app and start the activation process.Click the Launchpad icon in the Dock to display all of your apps.Click the Microsoft Word icon in the Launchpad.The What's New window opens automatically when you launch Word.
If a firewall or a proxy is preventing Lync from connecting to EWS, you may experience symptoms such as repeated credential requests, stale ABS, and intermittent Free/Busy presence issues.
Ports 443, 5060, and 5061 must be open on the firewall and on proxy servers to let traffic pass freely. For more information about firewall or proxy issues in an Office 365 environment, see the following Microsoft Knowledge Base article:
Microsoft Lync For Mac Keeps Disconnecting From Wifi
2409256 You can't connect to Skype for Business Online, or certain features don't work, because an on-premises firewall blocks the connection
Microsoft Lync Download Mac
Still need help? Go to Microsoft Community.