Answer:-4. Verify that the Skype users are signed in to a Microsoft Account
Note:- Skype users must be signed in with their Microsoft account (formerly Windows Live ID).
Reference: Let Lync Online users communicate outside your organization [Small Business]
Reference:-
https://support.office.com/en-ca/article/Let-Lync-Online-users-communicate-outside-your-organization-Small-Business-7f488f09-f004-4db5-aec5-01c262aa3d34? ui=en-US&rs=en-CA&ad=CA

Answer:-(1) and (4)

(4): Office 365 Small Business admins can troubleshoot email delivery problems by using the Exchange Online message trace tool. The tool helps admins track specific messages sent in the past 90 days.
(1): Office 365 users and admins can also use delivery reports in Outlook Web App to check the delivery status of messages theyve sent or received. If you sent a message to five people, for example, you can check the status of the delivery of that message to each person.
Go to Delivery reports settings:
1. Sign in to Outlook Web App.
2. At the top of the page, select Outlook (or Mail). Or, select the App launcher , and then select Outlook.



3. At the top of the page, select Settings
> Options.
4. In Options, select Organize email > Delivery reports. Or, in Options, under MAIL > Layout, select Delivery reports.
Reference: Troubleshoot email delivery using the Exchange Online message trace tool
https://support.office.com/en-au/article/Troubleshoot-email-delivery-using-the-Exchange-Online-message-trace-tool-e7758b99-1896-41db-bf39-51e2dba21de6
Reference:-https://support.office.com/en-sg/article/Delivery-reports-6556a1d7-e988-4428-88de-48a4ae58555f

Answer:-
3. Internet Explorer 10

Note:-Office 365 is designed to work with the current or immediately previous version of Internet Explorer. Office 365 does not offer code fixes to resolve problems you encounter when using the service with Internet Explorer 9. You should expect the quality of the user experience to diminish over time, and that many new Office 365 experiences might not work at all.

Reference: Office 365 system requirements
https://support.office.com/en-us/article/Office-365-system-requirements-719254C0-2671-4648-9C84-C6A3D4F3BE45

Answer:-

* You can synchronize a SharePoint library to your computer, and make the documents available to you when you are offline.
1. Make sure that the

OneDrive for Business client -
is installed on your machine.
2. Navigate to the library you want to synchronize.

3. Click the Synchronize the current document library icon ().

4. Click Sync Now.
* To map a network drive to a SharePoint Online library, follow these steps:
1. Sign in to the SharePoint Online site by using your Office 365 work or school account credentials. Make sure that you click to select the Keep me signed in check box.
2. Browse to the library that you want to map the drive for.
3. Click the LIBRARY tab on the ribbon, and then click Open with Explorer.
4. Click in an empty area of the Explorer window address bar, and then copy the URL of the library.
5. Right-click the Computer icon from the Desktop, or within Windows Explorer, and then click Map Network Drive.
6. Click the Connect to a Web site that you can store your documents and pictures link, and then click Next two times.
7. Paste the URL that you copied in step 4, click Next, and then follow the instructions in the wizard.
* Opening a SharePoint Library in a traditional "Explorer View" can make it easier to work with a number of files or folder maintenance tasks.
If it is a once-off requirement you could simply open the Library in Explorer view from the SharePoint Library toolbar or you may also Map a drive from Windows explorer for ongoing access to the Library.
Reference: How to configure and to troubleshoot mapped network drives that connect to SharePoint Online sites in Office 365

Answer:-2. Setup Assistant
Hint:-
The setup assistant provides information for deployment readiness. Incorrect answers:

Not (1): Office 365 Management Pack, which enables you to view all service communications within Operations Manager in System Center. Using this tool gives you access to the status of your subscribed services, active and resolved service incidents, and your Message Center communications.

Not (2): Config 365 will automatically configure Outlook to connect to an Office 365 mailbox and reattach your existing PST files to your new profile.