At a general level, Microsoft's Copilots are the tech giant's artifical intelligence (AI) companions. Microsoft has released several Copilots that can complete different tasks for different purposes. 

"We are the Copilotcompany," said Microsoft CEO Satya Nadella at the firm's Ignite event. "We believe in a future where there will be a Copilot for everyone and everything you do."

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However,the term Microsoft Copilot in itself refers to what was previously known as Bing Chat, an AI chatbot that can help with a series of tasks, such as coding, writing, generating images, answering general questions, and more. 

Other Copliots span Microsoft's applications and experiences, including Microsoft 365. These Copilots provide AI assistance in virtually every aspect of the workflow across the different Microsoft applications. 

Yes, sinceMicrosoft Copilotis just Bing Chat under a new name, it has been technically out since February when Bing Chat was released. However, under the new name, it has been publicly available since Microsoft Ignite in November. 

In terms of the other Copilots, they all have different release dates. Here's a topline review:

• Copilot in Windows started rolling out on Windows 11 on September 26 through a Windows 11 update.
• Copilot for Microsoft 365began rolling out for enterprise customers on November 1 and will roll out to non-enterprise users at a later date. 
• Copilot for Saleswill be available in the first quarter of 2024. 
• Copilot for Servicewill be generally available in early 2024. 
• Copilot in Vivawill begin rolling out to customers "later in 2023", according to Microsoft.
• Github Copilotwas the first tool to release, all the way back in 2021. 

Yes, Microsoft Copilot, formerly known as Bing Chat, is available for free. 

The cost of the application-specific Microsoft Copilots depends on the service it is being integrated into. 

For example,Copilot for Microsoft 365 has been made available for enterprise customers at a whopping$30 per user per month.

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For context, the price of the add-on is more than the lower-end plans of Microsoft 365 business subscriptions, which range from$12 to$23 per user per month, and almost the same as Microsoft's Office 365 E5 highest-end enterprise subscription, which costs$38 per month. 

However, Copilot in Windowswas rolled out for free via a Windows 11 update. 

Other applications likeCopilot for Sales and Copilot for Service have a lower cost of$50 per user. 

GitHub Copilot for an individual costs$10 per month or$100 per year, and$19 per user per month for businesses. 

Copilot for Microsoft 365 refers to the integration of the Copilot AI assistant into Microsoft's 365 productivity software family, including Teams, Word, Outlook, Excel, and PowerPoint. 

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For example, with Copilot for Microsoft 365?, the suite of Microsoft 365 applications, including Word, Excel, PowerPoint, Outlook, and Teams, will be infused with Copilot to optimize your workflow, such as generating text and tables in Word, summarizing and drafting emails in Outlook, and generating Python visualizations in Excel. 

Copilot in Windows is an AI assistant in Windows that can help you with a variety of tasks, both relating to your PC's settings and to generative assistance. For example, Copilot in Windows can turn on your computer's dark room, organize your windows, write an essay, help you shop, and more wth a simple conversational prompt. 

Microsoft's Security Copilot combines AI with cybersecurity to provide users with more advanced protection against attacks. 

Also: Boosting cybersecurity: Microsoft's AI-driven Security Copilot

The benefits that Microsoft Security Copilot provides for users include analyzing data sets to detect patterns of illicit behavior, which helps recognize cyberattacks, and increasing the speed and accuracy of real-time reactions with automated response mechanisms. 

At Microsoft Ignite, the company unveiled additions to its Copilot ecosystem, including Copilot for Service and Copilot for Sales. These two Copilots are focused on using AI to optimize business operations in enterprises.

Also: Microsoft launches two new Copilots, adding AI-guidance for Service and Sales

Enterprises can integrate Copilot for Service with customer relationship management (CRM) applications to receive "AI-guided answers" and "resources" for each customer, according to Microsoft. 

Copilot for Sales is the evolution of Sales Copilot, which is designed to be a companion for sellers to, "to increase productivity and personalize every customer interaction so they can close more deals," according to Microsoft.

Microsoft 365 Chat is part of the Microsoft 365 Copliot experience. It is a chat interface that has access to your data across different Microsoft work applications, which enables it to answer questions and assist with tasks.

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For example, you can ask Microsoft 365 Chat to "summarize unread messages", and it will look through all of your 365 applications to give you a concise summary of everything you missed. 

It can also catch you up on meetings, find documents for you, and answer questions based on the content you have in your documents, meetings, chats, and more. 

Google first announced its version of Microsoft Copilot, Duet AI, at Google I/O in May. Duet AI is an assistant that is integrated across Google Workspace, including applications such as Google Docs, Slides, Meet, Gmail, Chat, and more. 

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Duet AI in Google Workplace was made generally available for enterprises in August. Users can request a trial by completing this form, which asks for the number of employees at the interested user's organization, whether they are a Google Workspace customer, and contact details.