Hi RavinderKa,
Based on my research, so far, there is no information that Microsoft will fix the issue that Lync 2010 is not compatible with IOS 11, we suggest you upgrade to Skype for Business client, it will bring you the better user experience.
Here is a similar case for your reference
https://social.technet.microsoft.com/Forums/lync/en-US/c0113036-5af6-4ada-b86f-2ce9b19ae7bd/lync-2010-compatibility-ios-11?forum=ocsmobility
Hope this reply is helpful to you.
Regards,
Alice Wang
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