Hi @Manesh Shafiei
According to your case description, it is recommended that you create a shared calendar and a shared mailbox and add it to the Teams group so that both Mac and Windows users can view it.
Create a Shared Calendar
- Create a shared calendar in Outlook:
- Open Outlook and go to the Calendar view.
- Click "New Calendar" and create a new calendar. Name it appropriately for your team.
- Share a calendar with a team:
- Click on the newly created calendar and select "Share".
- Enter the email address of a team member or the Teams channel email address to share the calendar with them.
- Add a shared calendar to Teams:
- In Microsoft Teams, go to the channel where you want to add the calendar.
- Click the "+" icon to add a new tab.
- Select "Website" and enter the URL of the shared calendar in Outlook. This will embed the calendar into the Teams channel.
- Sync with a single calendar:
- Team members can add a shared calendar to their personal Outlook calendar by accepting the sharing invitation. This will allow the shared calendar events to appear in their personal calendars.
With these steps, you can create a shared calendar that is visible to all members of a Teams channel and synced with their personal calendars. For more detailed instructions, please refer to https://support.microsoft.com/en-us/office/create-view-or-delete-a-calendar-group-04fc64f2-b658-450b-8dce-dd27ed660570.
Create shared mailboxes
Create shared mailboxes so a group of people can monitor and send email from a common email addresses, like ******@contoso.com. When a person in the group replies to a message sent to the shared mailbox, the email appears to be from the shared mailbox, not from the individual user.
Shared mailboxes include a shared calendar. Your team can use the shared calendar as a place for everyone to enter their appointments. For example, if you have 3 people who do customer visits, all can use the shared calendar to enter the customer visit information.
For specific steps, please refer to https://learn.microsoft.com/en-us/microsoft-365/admin/email/create-a-shared-mailbox?view=o365-worldwide#create-a-shared-mailbox-and-add-members.
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